When to declare online sales to HMRC?

They really should teach more life skills in school IMHO, I had a lesson called 'Guidance' which was about drugs/relationships etc but nothing that would give you any indication of how to actually live in the real world once you've left your parents!

I suppose it is something I will worry about if I actually make any money at all.

Thanks again for your honesty and advice.

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Aye, I had that too. And religious stuff.

Might be more useful spending the time on kilowatt hours, self assessments and the food chain.

HMRC aren't likely to give a monkeys unless you actually earn enough to make a difference.
If you make money from photos, and you decided to pay tax on earnings, you would offset the cost of your camera gear (depreciation etc) as these would be the tools of the craft.
You would need to fill in a tax return, so not offsetting would be nuts.
Don't worry until you make anything.
Of course, there is the option to declare it immediately, whereby you would still need to fill in a tax form. This however, may allow you to regain some of your PAYE (someone clarify this please) as long as you are not set up as a limited company.